Brake-shoe.



PATENTED MAY 12, 1908.

W. H. v. ROSING & F. L. GORDON.

BRAKE SHOE.

parts of the braTe shoe,

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WILLIAM H. V. ROSING, OF ST. LOUIS, MISSOURI, AND FRANK L. GORDON, OF

CHICAGO, ILLINOIS.

BRAKE-SHOE.

Specification of Letters Patent.

Patented May 12, 1908 Application filed May 3, 1907. Serial No. 371,657.

To all whom it may concern:

Be it known that we, WILLIAM H. V. Ros- ING and FRANK L. GORDON,citizens of the United States, residing in the city of St. Louis, Stateof Missouri, and in the city of Chicago, county of Cook, and State ofIllinois, respectively, have invented certain new and usefulImprovements in Brake-Shoes, of which the following is a specification.

The object of our invention is to provide a brake shoe of such form andmaterials that the wheel to which it is applied will be worn down by therail and brake shoe without altering the form of its contour. ,As isWellknown this result is not attained by the brake shoes now in use, andit is, therefore, frequently necessary to take locomotives and cars outof service for the purpose of truing the wheels or fitting them with newtires. This results from the excessive wear of that part of the tirebearing upon the rail and from the projections formed by the flow ofmetal from below the brake shoe. When the distortion resulting fromthese causes reaches a certain limit, the wheels are liable to damagefrogs and switches, thus rendering their further use very undesirable.It is in order to avoid the loss incident to retiring the rolling stockfrom service for the purpose of truing or replacing the tires that Wehave devised our improved brake shoe, whichas above statedcounteractsthe uneven wear and irregularities referred to.

In the drawings-Figure 1 is a side view of a brake shoe constructedaccording to our invention. Fig. 2 is a view of the under side of thesame. Fig. 3 is a view of the side opposite to that shown in Fig. 1.Fig. 4 is a cross sectional View of the brake shoe and of part of thewheel to which it is applied. A

The brake shoe illustrated is of the general form covered by our PatentNo. 832,813, granted October 9, 1906, and consists of a tread-bearingpart 1 and a flange-bearing part 2 connected by bridges 3. The bridges 3form the sole connection between the two the spaces between thebridgesbeing open. The body of the brake shoe is preferably constructedof cast steel, and is provided upon its bearing surface with insets 4and 5, preferably of gray iron. The insets 4 in the tread-bearing partof the brake shoe are of slightly greater width than the main body ofthe tread-bearing part. The insets 5 in the fiange-bearing part of thebrake shoe are of substantially the same Width as that part of the shoe.It may not in all cases be found necessary to provide insets in theflange-bearing part of the brake shoe, and my invention is not to beconsidered as limited to the use of insets in both parts of the brakeshoe, but as covering broadly the construction set forth in the appendedclaims.

In operation, our improved brake shoe Wears the tires down substantiallyuniformly and without distorting the contour thereof, the projectingends of the insets 4 serving to remove the irregularities in the tireordinarily formed at either side of brake shoes of ordinaryconstruction. This advantageous action is believed to be in part due tothe fact that the cast iron insets 4 have a less abrasive action uponthe tire than the steel body 1 thereof, the result being that the insets4 cut away the irregularities due to the action of the body part 1, butdo not themselves give rise to the formation of such irregularities. Thecutting action of the tread-bearing part of the brake shoe, when formedaccording to our invention, is sufficient to cut down the part of thetire upon which it bears to an extent equal to the wear caused by therail and flange-bearing part of the brake shoe upon the remainder of thewheel thus preserving the contour of the tread in substantially itsoriginal form.

What we claim is 1. A brake shoe comprising a tread-bearing part, andinsets of a different material in said tread-bearing part, said insetsbeing of greater width than the remainder of said tread-bearing part.

2. A brake shoe comprising a tread-bearing part, and insets of a lessabrasive material in said tread-bearing part, said insets being ofgreater width than the remainder of said tread-bearing part.

3. A brake shoe comprising a cast steel tread-bearing part, and castiron insets in said tread-bearing part, said insets being of greaterwidth than the remainder of said tread-bearing part.

4. A brake shoe comprising a flange-bearing part and a tread-bearingpart separated by a space opposite the rail wearing part of the wheel,insets in said tread bearing part of 6. A brake shoe comprising abearing part,

and insets of a different material in said bearing part, said insetsbeing of greater Width 15 than the remainder of said bearing part.

WILLIAM H. V. ROSING. FRANK L. GORDON. Witnesses as to William H. V.Rosing:

CHARLES F. MoCUEN, ROY R. RooT. Witnesses as to Frank L. Gordon:

WALTER A. ScoTT, THoMAs' F. SHERIDAN.

